Manufacture of parchmentized paper-board



UNITED STATES PATENT OFFICE.

EMERY ANDREWS, OF KENNEBUNK, MAINE.

MANUFACTURE OF PARCHMEN-TIZED PAPER-BOARD.

SPECIFICATION forming part of Letters Patent No. 352,729: dated November 16, 1886. 1

Application filed February 17, 1886. Serial No. 192,226. (No specimens.)

To (1% whomtt may concern:

Be it known that I, EMERY ANDREWS, of Kennebunk, in the county of York and State of Maine, have invented a new and useful Improvement in'the Manufacture of Parchmentized Paper-Board, of which the following is a specification.

My invention relates to the manufacture of parchmentized paper material, such as described in Letters Patent of the United States No. 198,382, granted to T. Hanna andT; S.

, arises from the formation of a gas between the layers of paper after they have been united,

which causes blisters, or separates the layers of paper in spots, to the injury of the finished product. In Letters Patent, of the United States No. 312,945, dated February 24, 1885, granted to me, I describe a method of preventing such blisters by'subjecting the material,

/ I after being treated in the acid bath, to arefrigerating bath. While this process is successful for board less than about one-fourth of an inch in thickness, I have found that sheets of a greater thickness than this are still liable to blister, and the object of my invention is to overcome this difficulty; and it consists in perforating the board after it comes from theforming-machine, and before itis placedin awater bath to remove the acid used in its manufacture.

In carrying out my invention the sheets of board are formed as described in the Letters Patent above mentioned. Such sheets are then passed through a machine which perforates them at intervals of about one-half an inch, or less. I use a machine which contains a horizontal bar, in which are set a row of vertical needles about one-half aninch apart, this bar being of a length at least equal to the width of the, sheet of material to be perforated. is'by suitable means vertically reciprocated the sheet of material is fed beneath the points of the needles, and at each descent of the bar a row of holes is made across the sheet. As the needles are withdrawn the sheet is fed forward the required distance for the next row of holes, and this operation is repeated until the whole sheet has been quickly and thoroughly perforated. The sheet may then be While this bar carrying the needlesprocess of perforating acid-treated paper by means of a toothed roll while in the acid bath, and beforethe several layers thereof are united by pressure to form a solid board. I claim nothing described in said patent, as the perforations made, as therein set forth, would be so'closed by the press-rolls, which afterward unite the layers, that they would not accomplish the purpose of my invention, which is to allow the escape of the gas formed after the material has been placed in the water bath to remove or neutralize the acid; but

I claim- 1. The process of manufacturing parchmentized paper-board, which consists in first passing paper through a bath of parchmentizingliquid, then uniting several layers of such pa per by pressure to form a solid sheet, then perforating the same, so as to allow the escape of any gas that may be generated within such sheet, then submitting the same to a water or neutralizing bath, substantially as herein described. I

2. In the manufacture of paper-board composed of several layers of acid-treated paper,

perforating such board after the union of the form a sheet, then thickly perforating such sheet and submitting it to a water bath to remove the parchmentizing-liquid,substantial] y as specified.

In testimony whereof I have signed my name to this specification, in the presence of two sub. scribing witnesses, on this 26th day of January, A. D. 1886.

\Vitnesses: EMERY ANDREWS.

STEPHEN MOORE, HOMER ROGERS.

ICO 

